Re: Strange PC Shut-Off Problem

In article <1141611681.144088.3620@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
atn2002@xxxxxxxxxxx wrote:

Oops, it's actually only a Enermax 300watt EG301P-VB

SpeedFan says:
VCOREA: 1.63V
VCOREB: 1.49V
+3.3V: 3.28V
+5V: 4.95V
+12V: 11.98V

-12V: -12.69V
-5V: 0.53V
+5VSB: 5.43V
VBAT: 3.14V

My temperatures are excellent 34C Case, 45C CPU and less than 40C for
all the hard-drives.

I don't know what is good for voltages based on that so your help is
very appreciated!

Andrew

http://www.eprom.com/home/Power%20Supply/300wps.html

3.3V@28A 5V@30A 12V@15A -5V@1A -12V@1A +5VSB@xxxx
3.3V&5V to 170W max, total for all 300W max

I could see maybe 12V@12A load during spinup, and
12V@9A while gaming, so the 12V@15A should be
enough.

Your voltage readings look good, all except the -5V.
Maybe it is reading -5.3V ? In any case, the motherboard
won't be using the -5V (there is no particular reason
for it to need -5V). So the only reason to be disturbed
by that reading, is if the power supply actually has
a -5V output, and we use the oddness of that reading
to imply the power supply has some kind of problem.

Of course, power supplies do age, and they can exhibit
weakness (no longer able to deliver rated amps). But
I don't see anything here that is indicative of that.

You might examine the motherboard capacitors. Those
are the cylinders with plastic sleeves on them. If
the tops are bulged or there is a brown stain, where
a brown liquid dried, underneath the capacitors,
it could be you have bad caps. A visual inspection
is all you need, to get some idea whether the
motherboard has become "ripe".

That leaves whatever overheat protection method is
used by the motherboard, as a possible culprit.
AthlonXP motherboards had protection methods fitted
to the boards, for the more modern motherboards.
My motherboard uses a Winbond chip to measure the
diode temperature, and in fact MBM5 can read the
current diode temperature via the SMBUS. Other
motherboards may have a protection method, but
without an interface on it (as something like
that would be cheaper to manufacture). It would
be difficult to debug a problem with that protection
feature, because the protection circuit could be
at fault, or the thermal diode in the CPU could
be bad or flaky.

Paul
.

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